Well at least your all arguing for your cause in spirit.

The obvious problem is that once you open Pandora's box, it can't be closed.

There are any number of things that could go horribly wrong. I think this possibility is being highly ignored.


As for the UI, it would be easier if SE just added it themselves in a update rather than adding the requirement of an add-on.
The logistical problems would be a concern as well.

My opinion-
I personally think add ons should stay away form this game, and I stated that when they first announced it.
If add ons come I will most likely leave to something else. I think its bad enough we have to use light and hunting sites.
Adding dps meters will just create further strife, anyone doubting this is just ignoring past evidence.
As for the crafting, well a little organization goes a long way.